Pop writes:

Actually, I've considered that, but ... I've never been sure of
the right way to do it. How do you trigger the fuel pump; turn
ignition to ON (not start), or jumper in the test connector?
I've never been able to locate the right pins in the power
connector. What did you use for a valve?

The rail has a Schrader valve with 1/4 flare fitting. All you need is a
1/4 female flare on a hose. Connect it, run hose to fuel can, start the
car. Turn off car when done. Kind of like drawing blood.